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how does these two instruction mean?

To: linux-mips@linux-mips.org
Subject: how does these two instruction mean?
From: "Bin Chen" <binary.chen@gmail.com>
Date: Fri, 26 May 2006 14:19:08 +0800
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Hi,

In my program the gcc produce two lines of binary code:

100020e0:       ffc20000        sd      v0,0(s8)
100020e4:       dfc20000        ld      v0,0(s8)

first store v0->[s8], then load from [s8]->v0, why?

Thanks.

B.C

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